Patent Application
20160114407
The subject matter herein generally relates to a tool clamping device and a collet of the tool clamping device.
In a generally known type of tool clamping device for holding a shank portion of a cutting tool, a lock nut is screwed onto a holder, whereby the lock nut presses a tapered collet into a tapered hole of the holder. At this time, the diameter of the tapered collet is reduced, whereby the tapered collet holds the shank portion. Various such holders have been used in practical applications.
Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.
Several definitions that apply throughout this disclosure will now be presented.
The term “substantially” is defined to be essentially conforming to the particular dimension, shape or other word that substantially modifies, such that the component need not be exact. For example, substantially cylindrical means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like.
The present disclosure is described in relation to a tool clamping device and a collet of the tool clamping device.
The tool clamping device 100 can further include a collet 20. The collet 20 can be made of an elastic material. The collet 20 can include a nut mounting part 22 and a collet body 23 separated from the nut mounting part 22 by an annular concave part 21. The nut mounting part 22 can be substantially tapered, and an outer diameter can decrease along a direction away from the collet body 23. The nut mounting part 22 can be engaged with the lock nut 30 to clamp the cutting tool 200. The collet body 23 can be substantially tapered, and a diameter of the collet body 23 can decrease along a direction away from the nut mounting part 22. The collet body 23 can be engaged to the holding cavity 11 and configured for inserting the shank portion 210 of the cutting tool 200.
The collet 20 can define an axle hole 24 in a central portion thereof, and the axle hole 24 can run through the nut mounting portion 22, the annular concave part 21, and the collet body 23. The collet 20 can further define a plurality of slots 25. The slots 25 can be evenly arranged in the circumferential direction of the collet 20, and each slot 25 can extend along an axial direction of the collet 20 and communicate with the axle hole 24. One end of the slot 25 can extend to an edge of the nut mounting port 22 or an edge of the collet body 23. The slots 25 can be evenly spaced from each other. The collet 20 with theses slots 25 formed therein can expand or contract its own diameter by means of elastic deformation, thereby releasing or holding the shank portion 210 of the cutting tool 200.
The collet 20 can further include a plurality of grooves 26 arranged in the inner wall 201 thereof. When the cutting tool 200 is inserted in the collet 20, a fraction force between the collet 20 and the cutting tool 200 can be increased caused by the grooves 26.
The lock nut 30 can include an assembly hole 31 and an inner threaded portion 32 arranged in an inner surface of the assembly hole 31. The assembly hole 31 can be configured to assembly the collet 20 and the cutting tool 200, and the inner threaded portion 32 can be screwed on the outer threaded portion 12 of the holder 10, such that the lock nut 30 can be fixed to the holder 10.
In other embodiments, the grooves 26 can be linear grooves parallel to the axis of the collet 20 and arranged evenly spaced from each other.
In other embodiments, the grooves 26 can be linear grooves can be annular grooves parallel to each other. In other embodiments, the grooves 26 can other shape and can be arranged in random.
In assembling, the nut mounting part 22 of the collet 20 can be assembled in the assembly hole 31 of the lock nut 30, and the shank portion 210 of the tool 200 can be clasped into the collet 20 through the assembly hole 31. Then, the inner threaded portion 32 of the lock nut 30 can be threaded on the outer threaded portion 12 of the holder 10, and the lock nut 30 can be tightly assembled to the holder 10. At this time, the collet 20 can be pressed into the holder 10 and compressed in the radial direction, thereby fixing the tool 200.
The tool clamping device 100 can have the plurality of the grooves 26 on the inner wall of the collet 20, so the fraction force between the collet 20 and the cutting tool 200 can be increased than the conventional collet. Therefore, a grapping force of the tool clamping device 100 can be increased and the tool clamping device 100 can hold the cutting tool 200 stably.
The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of a tool clamping device and a collet. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, especially in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including, the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201410570112.0 | Oct 2014 | CN | national |
